HDSP-3530/-3730/-5530/

Transcription

1 H Seven Segment Displays for High Light Ambient Conditions Technical Data HDSP-3530/-3730/-5530/ Series HDSP-4030/-4130/-5730/ Series Features High Light Output Typical Intensities of Up to 7.0 mcd/seg at 100 ma pk 1 of 5 Duty Factor Capable of High Current Drive Excellent for Long Digit String Multiplexing Four Character Sizes 7.6 mm, 10.9 mm, 14.2 mm, and 20.3 mm Choice of Two Colors High Efficiency Red Yellow Excellent Character Appearance Evenly Lighted Segments Wide Viewing Angle Gray Body for Optimum Contrast Categorized for Luminous Intensity; Yellow Categorized for Color Use of Like Categories Yields a Uniform Display IC Compatible Mechanically Rugged Description The HDSP-3530/-3730/-5530/ and HDSP-4030/-4130/ -5730/-4200 are 7.6 mm, 10.9 mm/14.2 mm/20.3 mm high efficiency red and yellow displays designed for use in high light ambient condition. The four sizes of displays allow for viewing distances at 3, 6, 7, and 10 meters. These seven segment displays utilize large junction high efficiency LED chips made from GaAsP on a transparent GaP substrate. Due to the large junction area, these displays can be driven at high peak current levels needed for high ambient conditions or many character multiplexed operation. These displays have industry standard packages, and pin configurations and ± 1 overflow display are available in all four sizes. These numeric displays are ideal for applications such as Automotive and Avionic Instrumentation, Point of Sale Terminals, and Gas Pump E

2 Devices Part No. Package HDSP- Color Description Drawing 3530 High Efficiency Red 7.6 mm Common Anode Left Hand Decimal A mm Common Anode Right Hand Decimal B mm Common Cathode Right Hand Decimal C mm Universal Overflow ± 1 Right Hand Decimal D 4030 Yellow 7.6 mm Common Anode Left Hand Decimal A mm Common Anode Right Hand Decimal B mm Common Cathode Right Hand Decimal C mm Universal Overflow ± 1 Right Hand Decimal D 3730 High Efficiency Red 10.9 mm Common Anode Left Hand Decimal E mm Common Anode Right Hand Decimal F mm Common Cathode Right Hand Decimal G mm Universal Overflow ± 1 Right Hand Decimal H 4130 Yellow 10.9 mm Common Anode Left Hand Decimal E mm Common Anode Right Hand Decimal F mm Common Cathode Right Hand Decimal G mm Universal Overflow ± 1 Right Hand Decimal H 5531 High Efficiency Red 14.2 mm Common Anode Right Hand Decimal I mm Common Cathode Right Hand Decimal J mm Overflow ± 1 Common Anode K mm Overflow ± 1 Common Cathode L 5731 Yellow 14.2 mm Common Anode Right Hand Decimal I mm Common Cathode Right Hand Decimal J mm Overflow ± 1 Common Anode K mm Overflow ± 1 Common Cathode L 3900 High Efficiency Red 20.3 mm Common Left Hand Decimal M mm Common Anode Right Hand Decimal N mm Common Cathode Right Hand Decimal O mm Common Cathode Left Hand Decimal P mm Universal Overflow ± 1 Right Hand Decimal Q 4200 Yellow 20.3 mm Common Left Hand Decimal M mm Common Anode Right Hand Decimal N mm Common Cathode Right Hand Decimal O mm Common Cathode Left Hand Decimal P mm Universal Overflow ± 1 Right Hand Decimal Q Note: Universal pinout brings the anode and cathode of each segment s LED out to separate pins. See internal diagrams D and H. Absolute Maximum Ratings (All Products) Average Power per Segment or DP (T A = 25 C) mw Peak Forward Current per Segment or DP (T A = 25 C) ma (Pulse Width = 0.16 ms) DC Forward Current per Segment [2] or DP (T A = 25 C) ma Operating Temperature Range C to +85 C Storage Temperature Range C to +85 C Reverse Voltage per Segment or DP V Lead Solder Temperature (1.59 mm [1/16 inch] below seating plane) C for 3 sec Notes: 1. See Figure 1 to establish pulsed operating conditions 2. Derate maximum DC current above T A = 25 C at 0.50 ma/ C per segment, see Figure

3 Package Dimensions (HDSP-3530/-4030 Series) FUNCTION A B C D -3530/ / / / CATHODE-a CATHODE-a CATHODE [6] ANODE-d 2 CATHODE-f CATHODE-f ANODE-f NO PIN 3 ANODE [3] ANODE [3] ANODE-g CATHODE-d 4 NO PIN NO PIN ANODE-e CATHODE-c 5 NO PIN NO PIN ANODE-d CATHODE-e 6 CATHODE-dp NO CONN. [5] CATHODE [6] ANODE-e 7 CATHODE-e CATHODE-e ANODE-dp ANODE-c 8 CATHODE-d CATHODE-d ANODE-c ANODE-dp 9 NO CONN. [5] CATHODE-dp ANODE-b NO PIN 10 CATHODE-c CATHODE-c ANODE-a CATHODE-dp 11 CATHODE-g CATHODE-g CATHODE-b 12 NO PIN NO PIN CATHODE-a 13 CATHODE-b CATHODE-b ANODE-a 14 ANODE [3] ANODE [3] ANODE-b Package Dimensions (HDSP-3730/-4130 Series) 3-44

4 Package Dimensions (-5530/-5730 Series) Package Dimensions (-3900/-4200 Series) 3-45

5 Internal Circuit Diagram (HDSP-3530/-4030 Series) Internal Circuit Diagram (HDSP-3730/-4130 Series) Internal Circuit Diagram (HDSP-5530/-5730 Series) 3-46

6 Internal Circuit Diagram (HDSP-3900/-4200 Series) Electrical/Optical Characteristics at T A = 25 C Device Parameter Sym. HDSP- Min. Typ. Max. Units Test Condition Luminous Intensity/ I V µcd 100 ma Pk; Segment [9,10] of 5 Duty Factor (Digit Average) µcd 20 ma DC µcd 100 ma Pk; of 5 Duty Factor µcd 20 ma DC Peak Wavelength λ PEAK 3530/3730/ 635 nm 5530/ /4130/ 583 nm 5730/4200 Dominant Wavelength [11,12] λ d 3530/3730/ 626 nm (Digit Average) 5530/ /4130/ nm 5730/4200 Forward Voltage/Seg or D.P. V F All Devices V I F = 100 ma Reverse Current/Seg or D.P. I R All Devices 100 µa V R = 3.0 V Temp. Coeff. of V F /Seg or D.P. V F / C All Devices -1.1 mv/ C I F = 100 ma Thermal Resistance Rθ J-PIN 3530/4030/ 282 C/W/Seg LED Junction-to-Pin 3730/ / C/W/Seg 3900/ C/W/Seg Notes: 9. Case temperature of the device immediately prior to the intensity measurement is 25 C. 10. The digits are categorized for luminous intensity with the intensity category designated by a letter on the side of the package. 11. The dominant wavelength, l d, is derived from the CIE chromaticity diagram and is that single wavelength which defines the color of the device. 12. The yellow displays are categorizes as to dominant wavelength with the category designated by a number adjacent to the intensity category letter. 3-47

7 Figure 1. Maximum Allowed Peak Current vs. Pulse Duration. Figure 2. Maximum Allowable DC Current per Segment vs. Ambient Temperature. Figure 3. Relative Efficiency (Luminous Intensity per Unit Current) vs. Peak Segment Current. Figure 4. Peak Forward Segment Current vs. Peak Forward Voltage. Figure 5. Relative Luminous Intensity vs. DC Forward Current. Electrical These display devices are composed of eight light emitting diodes, with light from each LED optically stretched to form individual segments and a decimal point. The devices utilize LED chips which are made from GaAsP on a transparent GaP substrate. These display devices are designed for strobed operation. The typical forward voltage values, scaled from Figure 4, should be used for calculating the current limiting resistor value and typical power dissipation. Expected maximum V F values, for the purpose of driver circuit design and maximum power dissipation, may be calculated using the following V F MAX models: V F MAX = 2.15 V + I PEAK (13.5 Ω) For: I F 30 ma V F MAX = 1.9 V + I DC (21.8 Ω) For: 10 ma I F 30 ma Temperature derated strobed operating conditions are obtained from Figures 1 and 2. Figure 1 relates pulse duration (t p ), refresh rate (f), and the ratio of maximum peak current to maximum 3-48

8 dc current (I PEAK MAX/I DC MAX). Figure 2 presents the maximum allowed dc current vs. ambient temperature. Figure 1 is based on the principle that the peak junction temperature for pulsed operation at a specified peak current, pulse duration and refresh rate should be the same as the junction temperature at maximum DC operation. Refresh rates of 1 khz or faster minimize the pulsed junction heating effect of the device resulting in the maximum possible time average luminous intensity. The time average luminous intensity can be calculated knowing the average forward current and relative efficiency characteristic, η PEAK, of Figure 3. Time average luminous intensity for a device case temperature of 25 C, I V (25 C), is calculated as follows: I AVG I V (25 C) = [ ] [η PEAK ] [I V DATA SHEET ] 20 ma Example: For HDSP-4030 series η PEAK = 1.00 at I PEAK = 100 ma. For DF = 1/5: 20 ma I V (25 ) = [ ] [1.00][4.5 mcd] 20 ma = 4.5 mcd/segment The time average luminous intensity may be adjusted for operating junction temperature by the following exponential equation: I V (T J ) = I V (25 C) e [k(t J + 25 C)] where T J = T A + P D Rθ J-A Device K -3530/-3730/ / C -5530/ /-4130/ / C -5730/-4200 Mechanical These devices are constructed utilizing a lead frame in a standard DIP package. The LED dice are attached directly to the lead frame. Therefore, the cathode leads are the direct thermal and mechanical stress paths to the LED dice. The absolute maximum allowed junction temperature, T J MAX, is 105 C. The maximum power ratings have been established so that the worst case V F device does not exceed this limit. Worst case thermal resistance pin-to-ambient is 400 C/W/Seg when these devices are soldered into minimum trace width PC boards. When installed in a PC board that provides Rθ PIN-A less than 400 C/W/Seg these displays may be operated at higher average currents as shown in Figure 2. Optical The radiation pattern for these devices is approximately Lambertian. The luminous sterance may be calculated using one of the two following formulas. I V (cd) L V (cd/m 2 ) = A(m 2 ) πi V (cd) L V (footlamberts) = A(ft 2 ) Area/Seg. Area/Seg. Device mm 2 in / / / / Contrast Enhancement The objective of contrast enhancement is to optimize display readability. Adequate contrast enhancement can be achieved in indoor applications through luminous contrast techniques. Luminous contrast is the observed brightness of the illuminated segment compared to the brightness of the surround. Appropriate wavelength filters maximize luminous contrast by reducing the amount of light reflected from the area around the display while transmitting most of the light emitted by the segment. These filters are described further in Application Note Chrominance contrast can further improve display readability. Chrominance contrast refers to the color difference between the illuminated segment and the surrounding area. These displays are assembled with a gray package and untinted encapsulating epoxy in the segments to improve chrominance contrast of the ON segments. Additional contrast enhancement in bright ambients may be achieved by using a neutral density gray filter such as Panelgraphic Chromafilter Gray 10, or 3M Light Control Film (louvered film). 3-49